CN102998083B - The method of the actual wind load of platform is obtained by self-elevating drilling platform wind tunnel test - Google Patents
The method of the actual wind load of platform is obtained by self-elevating drilling platform wind tunnel test Download PDFInfo
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Abstract
The invention discloses a kind of method being obtained the actual wind load of platform by self-elevating drilling platform wind tunnel test, cardinal principle of the present invention be wind tunnel test is divided into waterborne and under water two parts carry out, test findings provides waterborne under each wind direction angle and two-part data result under water respectively with nondimensional form, comprises the dimensionless factor of force and moment in level, longitudinal direction, vertical three directions.Use this method to analyze all self-elevating drilling platforms or similar platform wind tunnel test, process is very easy, substantially increases work efficiency.The present invention, by by determining fast self-elevating platform (SEP) wind heeling moment, can improve the efficiency of stability analysis, saves cost.
Description
Technical field
The present invention relates to a kind of marine engineering design field, more particularly, relate to the determination of the drilling platform wind load for stability analysis.
Background technology
Obtain primarily of two kinds of methods for wind heeling moment: proper calculation and wind tunnel test.Whether each classification society rule in the detail property of there are differences for wind load computing formula, such as, considers impact meeting and the calculated case difference to some extent of the many factors such as capture-effect, turbulent flow, boundary layer, need take into account device structure the level of detail etc. of wind load.In addition, the wind load calculated according to the coefficient of modular formula and recommendation, the same yardstick self-elevating platform (SEP) product of contrast design abroad company, obviously higher.
As shown in Figure 2, be schematic diagram waterborne, stressed when platform is in free drifting state under water.D in figure
awfor above water is stressed, D
uwfor underwater portion is stressed, H
awfor the above water arm of force, H
uwfor the underwater portion arm of force, M
tfor the total wind heeling moment of platform according to above-mentioned parameter conversion gained.
For self-elevating drilling platform, the impact of wind load on platform is greater than the impact of wave and ocean current.Under towage operating mode, the motion of self-elevating drilling platform is comparatively complicated, and its load suffered mainly contains inertial load that Platform movement causes, deadweight and wind load etc.About occupying 40% ~ 50% of self-elevating platform (SEP) environmental load according to the wind load that modular formula calculates, is the important performance affecting parameters of self-elevating platform (SEP) stability and structural strength.Visible, comparatively reasonably determining the wind load of drilling platform, is the task of top priority to deep-water developments of drilling platform optimal design and platform.
Summary of the invention
The present invention is method self-elevating drilling platform results of wind tunnel being applied to real ship.By by determining fast self-elevating platform (SEP) wind heeling moment, the efficiency of stability analysis can be improved, save cost.
In order to achieve the above object, the invention provides a kind of method being obtained the actual wind load of platform by self-elevating drilling platform wind tunnel test, comprise the steps:
S1, be self-elevating drilling platform setting coordinate system, flat surface is XY plane, and vertical described flat surface is Z axis;
S2, design, measurement, and obtain data by wind tunnel test, and obtain parameter with following a-f formula:
Wind tunnel test be divided into waterborne and under water two parts carry out, test findings provides waterborne under wind angle ψ and two-part data result under water respectively with nondimensional form, comprise the dimensionless factor of force and moment in level, longitudinal direction, vertical three directions, be denoted as follows respectively:
A) longitudinal force coefficient:
B) cornering ratio:
C) vertical force coefficient:
D) heeling moment coefficient:
E) Trimming Moment coefficient:
F) torque coefficient:
Wherein symbol description and unit as follows
Wherein, the arm of force should from total wind-engaging surface pressing center to the vertical gauge of this platform underwater case center of lateral resistance; And the centre of draft of underwater portion is taken as the half of drinking water;
Calculate acquisition parameter to comprise: the parameter according to design or mensuration calculates platform parameter X' waterborne
aw, Y
a'
w, K'
aw, M'
aw, and platform parameter X' under water
uw, Y
u'
w, K'
uw, M'
uw;
Test obtains parameter and comprises: Z'
aw, N'
aw, Z'
uw;
Wherein, subscript aw is parameter waterborne, and subscript uw is parameter under water;
S3, the data utilizing S2 to obtain, according to following formula, wind heeling moment M corresponding under obtaining described wind angle ψ
t:
Above water wind is gone all out arm H
aw, unit is m:
Underwater portion wind is gone all out arm H
uw, unit is m:
Waterborne stressed, i.e. wind-force D
aw, unit is N:
D
aw=X
aw·cos(180-ψ)+Y
aw·sin(180-ψ)
Stressed D under water
uw, unit is N:
D
uw=X
uw·cos(-ψ)+Y
uw·sin(-ψ)
The wind heeling moment M that platform is total
t, unit is Nm:
M
t=(|H
aw|+H
uw)·D
aw
S4, given various wind angle ψ, repeat S2-S3 and obtain corresponding wind heeling moment M
t.
By above-mentioned steps, the wind heeling moment M that the various wind angle ψ that step S4 can be obtained are corresponding
tfor stability analysis.
The present invention relates to a kind of method that self-elevating drilling platform results of wind tunnel is applied to the actual wind load of platform, its cardinal principle be wind tunnel test be divided into waterborne and under water two parts carry out, test findings provides waterborne under each wind direction angle and two-part data result under water respectively with nondimensional form, comprises the dimensionless factor of force and moment in level, longitudinal direction, vertical three directions.Use this method to analyze all self-elevating drilling platforms or similar platform wind tunnel test, process is very easy, substantially increases work efficiency.
Accompanying drawing explanation
Fig. 1 is wind tunnel test coordinate schematic diagram;
Fig. 2 is the schematic diagram waterborne, stressed under water when being in free drifting state of platform.
Embodiment
The present invention is method self-elevating drilling platform results of wind tunnel being applied to the actual wind load of platform, by self-elevating drilling platform results of wind tunnel being applied to the method for the actual wind load of platform, obtain required wind heeling moment value when actual platform calculates stability fast.Specifically, the wind load numerical value of actual platform is obtained by testing the level of the platform above water that records and underwater portion, longitudinal direction, the dimensionless factor of force and moment in vertical three directions and relevant reduction formula.Detailed process of the present invention is as follows:
As shown in Figure 1, be self-elevating drilling platform setting coordinate system, flat surface is XY plane, and vertical described flat surface is Z axis.ψ is wind angle, and TRIM is platform inclination direction, and K, M, N are respectively the moment that platform corresponds to X-axis, Y-axis, Z axis under wind-force effect.Wind tunnel test be divided into waterborne and under water two parts carry out, test findings provides waterborne under each wind direction angle and two-part data result under water respectively with nondimensional form, comprise the dimensionless factor of force and moment in level, longitudinal direction, vertical three directions, be denoted as follows respectively:
A) longitudinal force coefficient:
B) cornering ratio:
C) vertical force coefficient:
D) heeling moment coefficient:
E) Trimming Moment coefficient:
F) torque coefficient:
In formula, symbolic interpretation is in table 1.
Table 1 symbol description and unit
According to code requirement, when wind heeling moment calculates, its arm of force should from total wind-engaging surface pressing center to the vertical gauge of this platform underwater case center of lateral resistance.When adopting the wind load based on formula, the centre of draft of underwater portion is taken as the half of drinking water.Use wind tunnel test data, the wind calculating above water and underwater portion is respectively gone all out arm, then determines total wind heeling moment according to the wind load size of actual measurement.
X ' for calculating in following formula
aw, Y '
aw, K '
aw, M '
awfor platform parameter waterborne, X '
uw, Y '
uw, K '
uw, M '
uwfor platform parameter under water, test the Z ' obtained
aw, N '
aw, Z '
uw, N '
uwonly for reference, do not participate in wind heeling moment and calculate, ψ represents wind direction angle.
The concrete grammar that self-elevating drilling platform results of wind tunnel is converted to real ship is as follows:
Above water wind is gone all out arm H
aw, unit is m:
Underwater portion wind is gone all out arm H
uw, unit is m:
Waterborne stressed, i.e. wind-force D
aw, unit is N:
D
aw=X
aw·cos(180-ψ)+Y
aw·sin(180-ψ)
Stressed D under water
uw, unit is N:
D
uw=X
uw·cos(-ψ)+Y
uw·sin(-ψ)
The wind heeling moment M that platform is total
t, unit is Nm:
M
t=(|H
aw|+H
uw)·D
aw
Conversion obtains the different wind heeling moment M of the correspondence under each different position angle wind angle ψ
tafter, namely can be used as input data and platform stability is calculated.
Preferred embodiment: be that example describes the present invention below in conjunction with certain platform.
Test findings provides waterborne under each wind direction angle and two-part data result under water respectively with nondimensional form, and comprise the dimensionless factor of force and moment in level, longitudinal direction, vertical three directions, result is as follows:
Above water result:
Ψ | X' | Y' | Z' | K' | M' | N' |
[°] | [-] | [-] | [-] | [-] | [-] | [-] |
0 | -0.9074 | 0.0124 | -0.2264 | 0.0020 | 0.8032 | 0.0200 |
10 | -0.8965 | 0.2134 | -0.2399 | 0.1586 | 0.7963 | 0.0188 |
20 | -0.8340 | 0.3888 | -0.2456 | 0.2900 | 0.7318 | 0.0122 |
30 | -0.7428 | 0.5488 | -0.2641 | 0.4110 | 0.6525 | 0.0056 |
40 | -0.6850 | 0.7169 | -0.2892 | 0.5303 | 0.6041 | 0.0042 |
50 | -0.6039 | 0.8492 | -0.3011 | 0.6076 | 0.5438 | 0.0040 |
Underwater portion result:
Ψ | X' | Y' | Z' | K' | M' | N' |
[°] | [-] | [-] | [-] | [-] | [-] | [-] |
0 | 0.0717 | 0.0000 | 0.1386 | 0.0000 | 0.0340 | 0.0000 |
10 | 0.0699 | -0.0072 | 0.1355 | -0.0006 | 0.0329 | -0.0002 |
20 | 0.0641 | -0.0143 | 0.1275 | -0.0003 | 0.0304 | -0.0006 |
30 | 0.0571 | -0.0225 | 0.1176 | 0.0012 | 0.0255 | 0.0001 |
40 | 0.0464 | -0.0291 | 0.1072 | 0.0037 | 0.0211 | 0.0004 |
50 | 0.0384 | -0.0355 | 0.1039 | 0.0076 | 0.0134 | 0.0002 |
To convert the wind tunnel obtained according to above water result:
Ψ | Xaw | Yaw | Daw | Kaw | Maw | Haw |
[°] | [N] | [N] | [N] | [Nm] | [Nm] | [m] |
0 | -3796736 | 51884 | 3796736 | 607963 | 244157983 | 64.3 |
10 | -3751128 | 892907 | 3849192 | 48211474 | 242060510 | 64.1 |
20 | -3489616 | 1626814 | 3835570 | 88154650 | 222453700 | 62.4 |
30 | -3108018 | 2296285 | 3839765 | 124936418 | 198347963 | 61.0 |
40 | -2866172 | 2999647 | 4123751 | 161201417 | 183635256 | 59.2 |
50 | -2526834 | 3553216 | 4346139 | 184699191 | 165305168 | 57.0 |
To convert the wind tunnel obtained according to underwater portion result:
Ψ | Xuw | Yuw | Duw | Kuw | Muw | Huw |
[°] | [N] | [N] | [N] | [Nm] | [Nm] | [m] |
0 | 300007 | 0 | 300007 | 0 | 10335373 | 34.5 |
10 | 292475 | -30126 | 293263 | -182389 | 10000993 | 33.5 |
20 | 268207 | -59834 | 272496 | -91194 | 9241039 | 31.8 |
30 | 238917 | -94144 | 253981 | 364778 | 7751530 | 27.1 |
40 | 194147 | -121760 | 226991 | 1124732 | 6414011 | 24.8 |
50 | 160673 | -148539 | 217066 | 2310260 | 4073353 | 20.2 |
Then to convert the wind heeling moment obtained suffered by platform according to above wind tunnel:
Ψ | Mt |
[°] | [tm] |
0 | 38222.0 |
10 | 38288.7 |
20 | 36797.1 |
30 | 34504.6 |
40 | 35340.2 |
50 | 34210.3 |
Had above result, namely can be used as input data can calculate platform stability.
The above; be only the present invention's preferably embodiment; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, all should be encompassed within protection scope of the present invention.
Claims (2)
1. obtained a method for the actual wind load of platform by self-elevating drilling platform wind tunnel test, it is characterized in that, comprise the steps:
S1, be self-elevating drilling platform setting coordinate system, flat surface is XY plane, and vertical described flat surface is Z axis;
S2, design, measurement, and obtain data by wind tunnel test, and with following a)-f) formula acquisition parameter:
Wind tunnel test be divided into waterborne and under water two parts carry out, test findings provides waterborne under wind angle ψ and two-part data result under water respectively with nondimensional form, comprise the dimensionless factor of force and moment in level, longitudinal direction, vertical three directions, be denoted as follows respectively:
A) longitudinal force coefficient:
B) cornering ratio:
C) vertical force coefficient:
D) heeling moment coefficient:
E) Trimming Moment coefficient:
F) torque coefficient:
Wherein:
X-longitudinal force, the i.e. power of X-direction, Chinese unit is newton, and English unit is N;
Y-transverse force, the i.e. power of Y-direction, Chinese unit is newton, and English unit is N;
Z-vertical force, the i.e. power of Z-direction, Chinese unit is newton, and English unit is N;
K-heeling moment, namely around the moment of X-axis, Chinese units Newtons rice, English unit Nm;
M-Trimming Moment, namely around the moment of Y-axis, Chinese units Newtons rice, English unit Nm;
N-moment of torsion, namely around the moment of Z axis, Chinese units Newtons rice, English unit Nm;
ρ-air specific weight=1.21, Chinese unit kg/m
3, English units/kg/m
3;
U-wind speed, Chinese unit meter per second, English unit m/s;
L
pp-main hull length, Chinese unit rice, English unit m;
In addition, the arm of force should from total wind-engaging surface pressing center to the vertical gauge of this platform underwater case center of lateral resistance; And the centre of draft of underwater portion is taken as the half of drinking water;
Calculate acquisition parameter to comprise: the parameter according to design or mensuration calculates platform parameter X' waterborne
aw, Y '
aw, K '
aw, M'
aw, and platform parameter X' under water
uw, Y '
uw, K'
uw, M'
uw;
Test obtains parameter and comprises: Z'
aw, N'
aw, Z'
uw;
Wherein, subscript aw is parameter waterborne, and subscript uw is parameter under water;
S3, the data utilizing S2 to obtain, according to following formula, wind heeling moment M corresponding under obtaining described wind angle ψ
t:
Above water wind is gone all out arm H
aw, unit is m:
Underwater portion wind is gone all out arm H
uw, unit is m:
Waterborne stressed, i.e. wind-force D
aw, unit is N:
D
aw=X
aw·cos(180-ψ)+Y
aw·sin(180-ψ)
Stressed D under water
uw, unit is N:
D
uw=X
uw·cos(-ψ)+Y
uw·sin(-ψ)
The wind heeling moment M that platform is total
t, unit is Nm:
M
t=(|H
aw|+H
uw)·D
aw
S4, given various wind angle ψ, repeat S2-S3 and obtain corresponding wind heeling moment M
t.
2. obtained the method for the actual wind load of platform according to claim 1 by self-elevating drilling platform wind tunnel test, it is characterized in that, the wind heeling moment M that the various wind angle ψ obtained by step S4 are corresponding
tfor stability analysis.
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CN105004503B (en) * | 2015-06-29 | 2018-09-11 | 中国海洋大学 | Self-elevating ocean platform wind force coefficient testing experimental system |
CN105711763B (en) * | 2015-12-23 | 2017-11-17 | 天津大学 | Ocean platform upper chunk typhoon load calculation method |
CN113504025B (en) * | 2021-09-13 | 2021-12-14 | 中国航天空气动力技术研究院 | Dynamic load testing method for wind tunnel with large attack angle and low frequency structure |
CN116296237B (en) * | 2023-05-18 | 2023-07-21 | 中国航空工业集团公司哈尔滨空气动力研究所 | Vertical wind load test method for large carrier rocket in low-speed wind tunnel |
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